Signet Jewelers (SIG), the world’s biggest diamond jewelry retailer, tried and failed for a second session to clear a buy point as the overall market faded. The stock rose as much as 2% early Monday, hitting a new high and clearing the 141.08 buy point. But the stock rolled over to close down 1.66 at 138, and volume was only 15% above average. The stock also cleared the buy point Friday before fading.